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There are going to be several built motor supercharged S65 V8 M3 V8 setups starting to roam the streets this year. ESS will have the VT2-725, Gintani will have their Stage III and Stage III+, and Active Autowerke will have their level 4. Each takes a different approach with ESS using the same Vortech V3Si blower their kits already employ, Gintani offering Vortech T-Trim, V3, and YSI options, and Active Autowerke employing a Rotrex C-38 but is able to accommodate other blowers as well.

Here is the different between a VT3-725 and a VT2-625 supercharger setup, both on DCT M3's with meth in SAE correction:

645 wheel for the built motor setup and 586 wheel for the stock internal setup. VT2-650 kits claim to be over 600 wheel on stock internals so one has to ask themselves if it is worth the cost to build a motor for only 50 wheel horsepower? $15,000+ on top of the supercharger kit for 50 wheel? Sure this power will likely be more reliable but one has to scratch their head at this price for performance ratio. It certainly makes sense to upgrade to a VT3 setup if one were to take the stock motor too far though.

The Vortech blower used here is approaching its limit. For a built motor application, it would seem to be a bit undersized as 12 psi is not providing all that much versus the 7.5 psi of the stock internal kit partially due to the lower compression. To really see solid gains a bigger blower is necessary. Gintani has shown up to 16.5 psi with a Vortech YSI thus far and higher dyno results on the lower reading Dyno Dynamics dyno.

Hopefully a comparison of the three major built motor setups will be able to be made soon.

What's the compression of the built motor car? If it's lowered, they will need to boost it even more...but should be able to relatively safe as long as the tune is good. The numbers look good to me on the 725 car if you consider what static cr the motor was built at. I'm assuming 10:2???

Lastly, I think it was a bad move on staying with an S trim for the built car. I would've wanted a JT at a minimum if it could fit.

What's the compression of the built motor car? If it's lowered, they will need to boost it even more...but should be able to relatively safe as long as the tune is good. The numbers look good to me on the 725 car if you consider what static cr the motor was built at. I'm assuming 10:2???

Lastly, I think it was a bad move on staying with an S trim for the built car. I would've wanted a JT at a minimum if it could fit.

If you were familiar then you wouldn't have made the comment you did. Go ahead, fill us all in on what that means.

A built motor doesn't cost anything? You expect more from a built motor, right? That is the topic pay attention.

My point is and continues to be that I would expect more power from a FI V8 motor no matter what it was... I never addressed the price of the built motor, I addressed the lackluster power result itself. As for the price itself, no its not cheap and yes for the money the buyer got screwed.

Regarding the other dyno posted... You got all the answers as always so again I say you amaze me with that skill of yours.

It's going to be a slug no matter what. It was a slug down low with the stock compression.

I didn't.

Ya but you can overspin the T-trim impeller more. The YSI is definitely a good start I'd go even bigger if I could. I want a Procharger F1-X but we'll figure that out later.

It will get worse and be more of a slug the lower you go wiht compression. Also you can over sping the SI and well people over spin Vortech blower all them time. For a built motor the YSI has to be used if it was my M it's a V8 for gods sake.